System time

System time 的协作图:

函数
UINT32	OsNS2Tick (UINT64 nanoseconds)
	纳秒转化成 tick 更多...
UINT64	LOS_TickCountGet (VOID)
	Obtain the number of Ticks. 更多...
UINT32	LOS_CyclePerTickGet (VOID)
	Obtain the number of cycles in one second. 更多...
UINT32	LOS_Tick2MS (UINT32 tick)
	Convert Ticks to milliseconds. 更多...
UINT32	LOS_MS2Tick (UINT32 millisec)
	Convert milliseconds to Ticks. 更多...

详细描述

函数说明

LOS_CyclePerTickGet()

UINT32 LOS_CyclePerTickGet

(

VOID

)

Obtain the number of cycles in one second.

Description:

This API is used to obtain the number of cycles in one second.

注意

• None

参数

None

返回值

UINT32

Number of cycles obtained in one second.

Dependency:

• los_sys.h: the header file that contains the API declaration.

参见

None

Obtain the number of cycles in one second.

返回

LITE_OS_SEC_TEXT_MINOR

在文件 los_sys.c 第 91 行定义.

{
    return g_sysClock / LOSCFG_BASE_CORE_TICK_PER_SECOND;
}

LOS_MS2Tick()

UINT32 LOS_MS2Tick

(

UINT32

millisec

)

Convert milliseconds to Ticks.

Description:

This API is used to convert milliseconds to Ticks.

注意

• If the parameter passed in is equal to 0xFFFFFFFF, the retval is 0xFFFFFFFF. Pay attention to the value to be converted because data possibly overflows.

参数

millisec

[IN] Number of milliseconds.

返回值

UINT32

Number of Ticks obtained through the conversion.

Dependency:

• los_sys.h: the header file that contains the API declaration.

参见

LOS_Tick2MS

Convert milliseconds to Ticks.

参数

millisec

返回

LITE_OS_SEC_TEXT_MINOR

在文件 los_sys.c 第 101 行定义.

{
    if (millisec == OS_MAX_VALUE) {
        return OS_MAX_VALUE;
    }
 
    return ((UINT64)millisec * LOSCFG_BASE_CORE_TICK_PER_SECOND) / OS_SYS_MS_PER_SECOND;
}

这是这个函数的调用关系图:

LOS_Tick2MS()

UINT32 LOS_Tick2MS

(

UINT32

tick

)

Convert Ticks to milliseconds.

Description:

This API is used to convert Ticks to milliseconds.

注意

• The number of milliseconds obtained through the conversion is 32-bit.

参数

tick	[IN] Number of Ticks. The value range is (0,OS_SYS_CLOCK).

返回值

UINT32

Number of milliseconds obtained through the conversion. Ticks are successfully converted to milliseconds.

Dependency:

• los_sys.h: the header file that contains the API declaration.

参见

LOS_MS2Tick

Convert Ticks to milliseconds.

参数

tick

返回

LITE_OS_SEC_TEXT_MINOR

在文件 los_sys.c 第 115 行定义.

{
    return ((UINT64)tick * OS_SYS_MS_PER_SECOND) / LOSCFG_BASE_CORE_TICK_PER_SECOND;
}

LOS_TickCountGet()

UINT64 LOS_TickCountGet

(

VOID

)

Obtain the number of Ticks.

Description:

This API is used to obtain the number of Ticks.

注意

• None

参数

None

返回值

UINT64

The number of Ticks.

Dependency:

• los_sys.h: the header file that contains the API declaration.

参见

None

Obtain the number of Ticks.

返回

LITE_OS_SEC_TEXT_MINOR

在文件 los_sys.c 第 82 行定义.

{
    return OsGetCurrSchedTimeCycle() / OS_CYCLE_PER_TICK;
}

函数调用图:

这是这个函数的调用关系图:

OsNS2Tick()

UINT32 OsNS2Tick

(

UINT64

nanoseconds

)

纳秒转化成 tick

Convert nanoseconds to Ticks.

参数

nanoseconds

返回

LITE_OS_SEC_TEXT_MINOR

在文件 los_sys.c 第 125 行定义.

{
    const UINT32 nsPerTick = OS_SYS_NS_PER_SECOND / LOSCFG_BASE_CORE_TICK_PER_SECOND;
 
    UINT64 ticks = (nanoseconds + nsPerTick - 1) / nsPerTick;
    if (ticks > OS_MAX_VALUE) {
        ticks = OS_MAX_VALUE;
    }
    return (UINT32)ticks;
}

这是这个函数的调用关系图: